There is the technique of boarding a cat after capsize-
WHILE it's righting!

A technique I learned from Chris Green- never actully practised it with him however.

When you are at the point when the mast comes off the water, and the boat starts to right-
you throw a leg/ body, arms, whatenver is easier for you onto the formally bottom hull and begin to get on the tramp on that gront corner as the tramp goes from vertical to horizontal.

It takes a bit of practice, and oh, you gotta be fast, faster than that!

It works though, and when timed right is the quickest and easiet way to get back on a cat the is being righted.
Really only works for one person though, then the other does the outside trap handle thing, or is helped back on by the crew on the boat.